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Condensed Consolidated Balance Sheets (Parenthetical) - $ / shares
Sep. 30, 2020
Dec. 31, 2019
Private Perpetual Preferred Units, Series 2019    
Capital    
Private perpetual preferred units, liquidation preference (in USD per share) $ 13.52 $ 13.52
Private perpetual preferred units, issued (in shares) 4,664,038 4,610,383
Private perpetual preferred units, outstanding (in shares) 4,664,038 4,610,383
Private Perpetual Preferred Units, Series 2014    
Capital    
Private perpetual preferred units, liquidation preference (in USD per share) $ 16.62 $ 16.62
Private perpetual preferred units, issued (in shares) 1,560,360 1,560,360
Private perpetual preferred units, outstanding (in shares) 1,560,360 1,560,360
Series PR Operating Partnership Units    
Capital    
Limited partner operating partnership units, outstanding (in shares) 81,140,140 81,387,763
Series ES operating partnership units    
Capital    
Limited partner operating partnership units, outstanding (in shares) 24,253,763 25,809,604
Series 60 operating partnership units    
Capital    
Limited partner operating partnership units, outstanding (in shares) 6,639,664 7,025,089
Series 250 operating partnership units    
Capital    
Limited partner operating partnership units, outstanding (in shares) 3,350,293 3,535,197
ESRT | Series PR Operating Partnership Units    
Capital    
General partner operating partnership units, outstanding (in shares) 2,883,759 2,996,520
Limited partner operating partnership units, outstanding (in shares) 170,108,330 178,897,876